Hemimorphite | Gemopedia

Found in several worldwide locations that are often zinc-rich environments, most hemimorphite crystals are white to grayish white, yellowish or totally colorless. But when the robin's egg blue hues are found, miners know they have hit a pocket of true gem-quality material. Not only is fine quality hemimorphite geologically scarce, but there are few locations that have the right combination of trace minerals that create this stunning blue color. This gem is often appreciated as natural specimens due to its almost bubbly botryoidal crystal habit.
Alternate
Names
Calamine
Colors
Blue, Bluish Gray ,Colorless, White, Gray, Yellow, Green, Pink, Purple, and Brown, sometimes Banded

Hemimorphite Classification

Common Name

Hemimorphite

Species

Hemimorphite

Variety

Colors

Blue, Bluish Gray ,Colorless, White, Gray, Yellow, Green, Pink, Purple, and Brown, sometimes Banded

Alternate Names

Calamine

Gemstone Groups

Key Separations

SG, RI, birefringence, optic character and sign

Comments

Hemimorphite Optical Properties

Transparency

Transparent - Translucent

Refractive Index

1.614-1.636
Tolerance:(+0.003/-0.003)

Birefringence

0.022

Optic Character

Biaxial

Optic Sign

Positive

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV: Inert
LWUV: Inert

CCF Reaction

Pleochroism

Unobservable

Dispersion

Strength: moderate fire Value: 0.02

Comments

Hemimorphite Chemistry & Crystallography

Chemical Name

hydrated zinc silicate hydroxide

Chemical Formula

Zn4Si2O7(OH)2.H2O

Synthesis

Crystal System

Orthorhombic

Classification

Silicate

Nature

Natural

Crystallinity

Crystalline

Comments

Hemimorphite Characteristic Physical Properties

Hardness

4.5-5

Streak

White

Specific Gravity

3.3-3.5 Typical:3.45

Toughness

Poor

Inclusions

Luster

Vitreous

Stability

Fracture

Uneven, Subconchoidal

Cleavage

Perfect, in one direction, Good, in one direction

Comments

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